Citazione Stile APA (7a Edizione)

Harlow, W. M. (1959). Fruit key and twig key to trees and shrubs. Dover.

Citazione stile Chigago Style (17a edizione)

Harlow, William M. Fruit Key and Twig Key to Trees and Shrubs. New York, USA: Dover, 1959.

Citatione MLA (9a ed.)

Harlow, William M. Fruit Key and Twig Key to Trees and Shrubs. Dover, 1959.